Interface unit for a computer



FIG. 1 is a rear perspective view of an interface unit for a computer showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

Portions in broken lines are for illustrative purposes only and forms no part of the claimed design. 

I claim the ornamental design for an interface unit for a computer, as shown. 